5981399921 has 8 divisors (see below), whose sum is σ = 6844921920. Its totient is φ = 5120137008.

The previous prime is 5981399911. The next prime is 5981399927. The reversal of 5981399921 is 1299931895.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5981399921 - 2¹⁰ = 5981398897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5981399927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 559091 + ... + 569688.

It is an arithmetic number, because the mean of its divisors is an integer number (855615240).

Almost surely, 2^5981399921 is an apocalyptic number.

It is an amenable number.

5981399921 is a deficient number, since it is larger than the sum of its proper divisors (863521999).

5981399921 is a wasteful number, since it uses less digits than its factorization.

5981399921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129543.

The product of its digits is 1574640, while the sum is 56.

The square root of 5981399921 is about 77339.5107367508. The cubic root of 5981399921 is about 1815.2409499317.

The spelling of 5981399921 in words is "five billion, nine hundred eighty-one million, three hundred ninety-nine thousand, nine hundred twenty-one".